Callahan County, TX Building Permits, Zoning & Septic Rules

Unincorporated Callahan County, Texas does not issue a general residential building permit and has no county zoning ordinance¹². Septic is different: an on-site sewage facility (OSSF) generally needs a permit and approved plan, while a subdivision using OSSFs must first submit planning materials to the county's Designated OSSF Representative³⁴.

At a glance

Building permit: Not required outside city limits; Callahan County has no building department¹
County zoning: None countywide; Texas gives counties zoning power only in narrow special cases and Callahan has none²⁵
RV or tiny home on your own land: Unrestricted by county zoning, since Callahan County has none⁵
Septic permit: Generally required; a subdivision using OSSFs also needs county approval of planning materials first³⁴
Owner-builder exemption: No county rule confirming one has been found; Callahan County publishes no building-permit program to exempt from⁶
Driveway onto a state highway: Needs a TxDOT Form 1058 access driveway permit before construction⁷
Well in a regulated subdivision: County approval of the well location is required before the structure is occupied⁸
Operating an RV park (3+ RVs): County ordinance requires at least 5.0 acres and Commissioners' Court approval of an infrastructure plan⁹

Who to call

Also useful

Callahan County Clerk

Records subdivision plats, deeds, and other official public records for Callahan County; the county's subdivision, RV park, and manufactured home rental community ordinances all direct applicants to file plans here

325.854.5815

1257 FM 2047, Baird, Texas 79504

Also useful

Callahan County Judge

Presides over Commissioners' Court, which approves subdivision plats, RV park and manufactured home community infrastructure plans, and driveway permits onto county roads; the office to call for anything that needs a Commissioners' Court decision

325.854.5805

1257 FM 2047, Baird, TX 79504

Roads & driveways

Callahan County Commissioners (Precincts 1-4)

County road maintenance by precinct; the commissioner for the precinct where your property sits signs off on access driveway permits onto county roads and inspects subdivision road construction

325-854-5805

1257 FM 2047, Baird, TX 79504

Also useful

Callahan County RV Park Infrastructure Regulations (Commissioners' Court ordinance)

Regulates RV parks (three or more rented recreational-vehicle spaces run as a business), not a single RV on one owner's own land; sets minimum tract size, infrastructure, and approval steps

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Callahan County, Texas?

No. Unincorporated Callahan County issues no general residential building permit: the county has no building or zoning department, and Texas counties don't have general building-permit authority outside city limits¹. That covers a new house, barn, shop, or shed built on your own unincorporated land. Texas does require factory-built industrialized housing and modular components to be manufactured to current code editions (2021 IRC/IBC family, 2020 NEC) starting July 1, 2024, but that rule governs the manufacturer's design package, not a county inspection of your site-built home¹⁰. If you're creating a new lot rather than buying an existing one, Callahan County does regulate that: a tract split into two or more parts for lots, streets, or similar uses must be platted and approved by the Commissioners' Court before the County Clerk will record it, with a $500 preliminary plat review fee and two Commissioners' Court readings; tracts kept over 15 acres are excluded from this subdivision process entirely¹¹.

Who handles permits and land-use questions in Callahan County?

There's no dedicated Callahan County building department to call. The County Clerk's office records subdivision plats, deeds, and the plans required for RV parks and manufactured home rental communities¹². The County Judge's office presides over the Commissioners' Court, which is the body that actually approves subdivision plats, RV park and manufactured-home-community infrastructure plans, and variances¹³. For anything touching a county road, including a driveway permit, the commissioner for your precinct is the one who signs off, and all four precincts share the same courthouse contact line¹⁴.

Does Callahan County have zoning?

No. Callahan County has adopted no county zoning ordinance, and Texas law gives counties zoning power only through narrow, geographically specific statutes that don't reach Callahan County²⁵. Because there's no zoning, county rules don't set a minimum home size, minimum lot size, building height limit, or zoning district for your own unincorporated land, and accessory dwellings, RVs, tiny homes, manufactured homes, and temporary camping aren't restricted by county zoning⁵. That's different from operating an RV park or a manufactured home rental community as a business: Callahan County's Commissioners' Court has separately adopted infrastructure ordinances for those, defining an RV park as three or more rented recreational-vehicle spaces and requiring at least 5.0 acres and Commissioners' Court approval before construction⁹. A single RV or tiny home on your own tract doesn't trigger those rules.

How do septic permits work in Callahan County?

Texas generally requires a permit and approved plan to construct, install, alter, extend, repair, or operate an OSSF, and the local permitting authority may impose stricter requirements³. For a Callahan County subdivision using OSSFs outside a city, owners must submit planning materials — including a site plan, topographic map, floodplain map, soil survey, and drainage plan — to the county's Designated OSSF Representative before individual-lot permitting can begin⁴. The Commissioners' Court and OSSF Representative must decide those materials in writing within 45 days, and a tract subdivided without complying cannot obtain an OSSF construction or modification permit⁴. Ask the County Judge's office to identify the current permitting authority for a parcel outside that subdivision process¹³. A single-family home on at least 10 acres may qualify for the state exemption only after a licensed site evaluation and only if the system remains at least 100 feet from property lines, keeps effluent onsite, creates no nuisance or groundwater pollution, and serves the tract's only dwelling¹⁵. Only about 0.8% of Callahan County soils lack severe limits for a conventional drain field, so evaluate the site before choosing a system¹⁶.

Can you live in an RV or tiny home on your land in Callahan County?

Yes, on your own unincorporated land, because Callahan County has no zoning ordinance to restrict it⁵. That answer changes if you want to rent out space to others: Callahan County's ordinance defines an RV park as "any lot or tract of land designed to accommodate three or more recreational vehicles ... occupied or intended to be occupied for dwelling or sleeping purposes for any length of time" run as a business, and requires a minimum 5.0-acre tract plus Commissioners' Court approval of an infrastructure plan before construction⁹. A separate county ordinance covers manufactured home rental communities of two or more leased lots¹¹; ask the County Clerk's office before developing either kind of rental setup¹².

Building a home in Callahan County: the steps, in order

Confirm your tract is outside every city's limits and extraterritorial jurisdiction; city authorization is also required for subdivision filings in an ETJ¹¹.
If you're splitting a larger tract into new lots, plat it: expect a $500 preliminary review fee and two Commissioners' Court readings before recording, unless an exclusion applies¹¹.
No general county residential building permit is required on unincorporated land¹.
Identify the OSSF permitting authority and obtain the required permit and approved plan, unless the tract satisfies every condition of the 10-acre exemption³. A subdivision using OSSFs must also submit its planning materials for the county's 45-day review⁴.
Line up water: a structure in a regulated subdivision must connect to an approved public supply or an individual well with a location approved by Callahan County before occupancy⁸. This approval does not establish a countywide drilling permit for every well⁸.
If your driveway connects to a state highway, file TxDOT Form 1058 and wait for a fully executed permit before construction on the right-of-way⁷.
Record required plats and plans with the County Clerk¹².

What to check before you buy land in Callahan County

Soils: only about 0.8% of Callahan County soils lack severe limits for a conventional septic drain field, so get a site evaluation before assuming a standard system will work¹⁶. Slope: 88.8% of the county's land is at 15% slope or less¹⁷. Drought: Callahan County spends about 24.5% of years in severe drought, so investigate well yield and water availability¹⁸. In a regulated subdivision, the county must approve an individual well's location before the connected structure is occupied⁸. Access: a driveway onto a state highway needs a TxDOT Form 1058 permit before construction on the right-of-way⁷. The nearest city of 100,000 or more is about 24 miles from the county center, and county population density is about 16 people per square mile¹⁹²⁰. The effective property tax rate is about 1.1%, with a median annual bill near $1,587²¹²².

Watch-outs

Callahan County has not published an owner-builder exemption from any permitting program, but that's largely moot since the county has no general building-permit program to exempt yourself from in the first place⁶.
The subdivision setback rule of 50 feet for well/septic and 25/10 feet for small lots applies only inside Callahan County's regulated subdivisions, not to every unincorporated tract²³.
Callahan County's RV park and manufactured-home-rental-community ordinances regulate rental businesses (three or more RVs, or two or more leased manufactured-home lots), not a single RV or manufactured home on your own land⁹.

Sources

Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

How Callahan County scores

Seclusion51100% ev.

Self-Sufficiency3198% ev.

Admin Boringness8290% ev.

Durability56100% ev.

Property Autonomy71100% ev.

Carry Cost78100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$221kTypical home

1.1%Property tax

$2,550Land / acre

28.6"Annual rain

24.5% of yrsSevere drought

37.2 / yr (+24.9)Mid-century 100°F days

29.4 daysMid-century dry spell

1.95" (+4.6%)Mid-century 1-day rain

1.34×Wildfire change factor

100%Forward climate coverage

$2,346Home insurance / yr

0.3% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

69,044People within 30 min

677,252People within 2 hr

9,672Radius comparison (15 mi)

16People / sq mi

0.1%Federal land

88.8%Land at 15% slope or less

0.8%Septic soil without severe limits

4,757 acWorkable land screen

14%Wooded land

6.8 tonsBiomass / forest ac

64.4°FAvg temp

Answers from the rulebook for Callahan County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Callahan County rules

Zoning districts · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
SetbacksSpecified
Well/septic separation and building setback lines for certain subdivision lots outside incorporated city boundaries in Callahan County.
- Well and septic set bank lines must be at least 50 feet from property lines on all sides and in every dimension.
- Lots of 1 to 2.99 acres have setback lines of 25 feet from right-of-way lines and 10 feet from back and side property lines.
- The rule is located in the county subdivision regulations and applies to the regulated subdivision context.
- Municipal requirements may govern in a city's extraterritorial jurisdiction where they conflict with county requirements, subject to state law.
well and septic set bank line: >= 50 feet (from property lines on all sides and in every dimension) · front setback from right-of-way for 1 to 2.99 acre lots: 25 feet · rear and side setbacks for 1 to 2.99 acre lots: 10 feet
“twenty-five feet (25') from the right-of-way lines”
Callahan County Subdivision Regulations ↗Re-checked Sep 11, 2026
Lot coverage · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Who permits septicCounty
OSSF planning and permitting administration for subdivisions outside incorporated cities in Callahan County, Texas.
- The county regulation applies to subdivisions using OSSFs for sewage disposal.
- Planning materials must be submitted before the process for individual-lot OSSFs can begin.
- The planning materials must include an overall site plan, topographic map, 100-year flood plain map, soil survey, locations of water wells, Title 30 TAC Chapter 285.91(10) easements, an OSSF compatibility report, and a comprehensive drainage plan.
- The Callahan County Commissioners’ Court and OSSF Representative must approve or deny the planning materials in writing within 45 days of receipt.
- A tract subdivided without compliance is ineligible to obtain an OSSF construction or modification permit.
planning-material decision deadline: 45 days (from receipt)
“Before the process for individual lot On-Site Sewage Facilities (OSSF) can begin, owners proposing subdivisions using OSSFs for sewage disposal shall submit planning materials for these developments to the Designated OSSF Representative for Callahan County.”
Callahan County, Texas Subdivision Regulations ↗Re-checked Sep 11, 2026
Well permitLimited
Individual water wells serving structures in subdivisions governed by Callahan County’s subdivision regulations outside incorporated city boundaries.
- The cited county rule requires approval of the well location before occupancy but does not establish a general countywide drilling permit requirement for every water well.
- The requirement is tied to subdivision water-supply certification.
“No structure in this subdivision shall be occupied until connected to an individual water well, the location of which have been approved by Callahan County.”
Callahan County, Texas Subdivision Regulations ↗Re-checked Sep 11, 2026
Mandatory utility hookupWater (with conditions)
Structures in subdivisions governed by Callahan County’s subdivision regulations outside incorporated city boundaries.
- A structure may use either an approved public water supply system or an individual water well, depending on the applicable water-supply certificate.
- For public water supply, the approved system must have adequate quantity and provisions to provide service to each lot according to the water-supply system’s policies.
- For individual wells, the well location must be approved by Callahan County.
- The cited regulation addresses water connection; it does not establish a general county sewer-connection requirement.
“No structure in this subdivision shall be occupied until connected to an individual water well, the location of which have been approved by Callahan County.”
Callahan County, Texas Subdivision Regulations ↗Re-checked Sep 11, 2026
Subdividing landRegulated (with conditions)
Subdivision platting and related construction standards for land outside incorporated city boundaries in Callahan County.
- A tract divided into two or more parts for lots, streets, alleys, parks, or other public portions must be platted and submitted to the Commissioners' Court before filing with the County Clerk.
- In a city's extraterritorial jurisdiction, both city and county authorization are required before filing; conflicting city provisions govern if they do not conflict with state law.
- Subdivision plats require two Commissioners' Court readings before recording.
- A preliminary plat review fee of $500.00 is required at submission.
- The ordinance excludes or does not treat as subdivisions certain transactions, including intra-family transfers, boundary-line transactions, court-ordered partitions, specified partitions among joint owners, tracts over 15 acres regardless of the number of tracts created, and transfers of rights-of-way or easements.
- A division of a tract into two parcels within a two-year period by the same or different owners is not considered a subdivision under the ordinance.
preliminary plat review fee: 500 USD · required plat review readings: 2 readings (before recording with the County Clerk) · excluded tract size: > 15 acres (the ordinance states tracts over fifteen acres are not considered subdivisions regardless of number of tracts created)
“submitted to the Commissioners’ Court for approval”
Callahan County Subdivision Regulations ↗Re-checked Sep 11, 2026
Building permitNot required
Callahan County lists no building or zoning department among its offices and Texas counties lack general building-permit authority in unincorporated areas; no county residential building permit is issued.
Callahan County, Texas - Commissioners Court (County Offices) ↗Scouted from the county site, not yet independently re-checked
County-wide zoningAbsent
No county planning or zoning department is listed among Callahan County offices; Texas counties generally have no zoning authority in unincorporated areas.
Callahan County, Texas - Commissioners Court (County Offices) ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building code adoptedPartial
Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.
- The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
- The effective date is July 1, 2024.
- The International Existing Building Code applies to alterations of portable industrialized buildings.
- Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
- Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
- Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.
effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)
“July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
Septic permitRequired
Construction, installation, alteration, extension, or repair of an OSSF in Texas
- A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.
- A 10-acre exemption may apply only if all listed conditions are met: site evaluation by a TCEQ-licensed site evaluator or professional engineer; single-family dwelling on at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposed of on the property; and the single-family dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may also be exempt if the stated conditions are met.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other TCEQ conditions must be met) · minimum OSSF distance from property line for 10-acre exemption: >= 100 feet (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun; written report to permitting authority)
“A permit is required to construct, install, alter, extend, or repair an OSSF. [...] An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Required — Construction, installation, alteration, extension, repair, and operation of OSSFs, including septic systems, in Callahan County under Texas statewide requirements.
  “A permit is required to construct, install, alter, extend, or repair an OSSF. Always check with your local permitting authority. Local permitting programs can be more stringent than State minimums.”
  Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 11, 2026
Septic inspectionLimited
OSSF installation and, where applicable, maintenance inspections in Texas
- Authorized agents or their designated representatives inspect system installation.
- Some permitting authorities impose more stringent requirements.
- Maintenance-provider inspection and reporting requirements apply to systems and circumstances governed by 30 TAC §285.91(4).
- Electronic monitoring may reduce reporting to every six months where the stated monitoring conditions apply.
reduced maintenance reporting interval with qualifying electronic monitoring: 6 months (only where the system uses the specified electronic monitoring, automatic notification, and disinfection monitoring)
“Many times, the AA has a "designated representative" (DR) to assist them with their responsibilities, which include reviewing plans for constructing, altering, extending or repairing each OSSF; issuing permits; and inspecting system installation. [...] If the system uses an electronic monitor, automatic radio or telephone to notify the maintenance provider of system or component failure and to monitor the amount of disinfection in the system, reporting may be reduced to every six months.”
Basics for Septic Systems ↗Re-checked Sep 12, 2026
Off-grid sanitationLimited
On-site sanitation using an OSSF instead of a sewer connection in Callahan County.
- An OSSF generally requires a permit and approved plan before construction, alteration, repair, extension, or operation.
- A single-family dwelling on a tract of at least 10 acres may qualify for the state permitting exemption only if all listed site-evaluation, nuisance, groundwater, setback, on-site-disposal, and single-dwelling conditions are met.
- Local permitting authorities may impose more stringent requirements.
minimum tract size for exemption: >= 10 acres (single-family dwelling and all other stated conditions required) · minimum setback from property line: >= 100 feet (for the 10-acre exemption)
“An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 11, 2026
Driveway accessRequired
New or modified access driveways connecting property to a Texas state highway right of way.
- A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
- No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
- All entrances and exits, including radii, must be confined within the permittee's property frontage.
- One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
- ADAAG and Texas Accessibility Standards apply.
private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet
“A driveway must be constructed in accordance with a fully executed driveway permit”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
Permit processPublished (with conditions)
Constructing a new driveway or revising an existing driveway on the right of way of a Texas state highway.
- The applicant should contact the local District TxDOT office.
- The applicant must submit Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way.
- The application must be for the bona fide purpose of securing or changing access to the owner's property, not parking or servicing vehicles on state highway rights of way.
- No construction may begin on the right of way until a fully executed driveway permit is received and the applicant gives TxDOT 24-hour notification.
- The driveway must comply with the executed permit and applicable regulations; TxDOT inspection must find construction satisfactory.
- Where a local public agency has permitting authority, drainage impacts on the state highway system still require TxDOT approval before local approval.
- Driveway geometrics, utilities, environmental requirements, wetlands considerations, ADAAG, TAS, and other applicable state and federal laws must be considered.
required form: Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way · advance notification: 24 hours (Notification to TxDOT is required before construction on the right of way.) · private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · minimum driveway radius to highway pavement: >= 15 feet
“The applicant shall complete and submit to TxDOT a Form 1058”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Owner-builder exemption — Owner-builders constructing or improving residential property in Callahan County.
Inspections — Residential building inspections in Callahan County, including unincorporated areas.
Certificate of occupancy — Residential buildings in Callahan County, including unincorporated areas.
Local zoning — Aggregate of municipal and other local zoning controls within Callahan County; this claim does not attribute municipal ordinances to the county.
Short-term rentals — Short-term rental use in Callahan County.

1 more unanswered

Permit fees

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Callahan County, Texas

Is Callahan County a good place to live off-grid or homestead?

Callahan County scores 61/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost. Watch-outs: workable self-sufficiency basics (28.6″/yr rainfall).

Do you need a building permit in Callahan County, Texas?

Callahan County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Callahan County (TCEQ authorized agent for on-site sewage). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Callahan County?

Living in an RV on your own land in Callahan County is allowed: Unincorporated Callahan County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Callahan County has no zoning ordinance. The county legal census found no county zoning ordinance, citing callahancounty.org. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Callahan County, Texas?

Land in Callahan County runs about $2,550 per acre, based on the latest county data.

What is the water situation in Callahan County?

Callahan County gets about 28.6" of rain a year, with severe drought in roughly 24.5% of years.

How remote is Callahan County?

A representative private-land location has about 69,044 people within a 30-minute drive and 677,252 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Callahan County, Texas

At a glance

Who to call

Do you need a building permit in Callahan County, Texas?

Who handles permits and land-use questions in Callahan County?

Does Callahan County have zoning?

How do septic permits work in Callahan County?

Can you live in an RV or tiny home on your land in Callahan County?

Building a home in Callahan County: the steps, in order

What to check before you buy land in Callahan County

Watch-outs

Sources

Callahan County in Texas

How Callahan County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Callahan County

Callahan County rules

Texas rules that apply here

Still unanswered

Living off-grid in Callahan County, Texas

Is Callahan County a good place to live off-grid or homestead?

Do you need a building permit in Callahan County, Texas?

Can you live in an RV or tiny home on your land in Callahan County?

How much does land cost in Callahan County, Texas?

What is the water situation in Callahan County?

How remote is Callahan County?

How Callahan compares in Texas